Field Emission Properties Optimization of CsPbBr3 Microarrays via Metal Adlayers

The application of all inorganic cesium lead halide perovskites in optoelectronic devices has garnered extensive research interest over the past decade, however little studies focused on their field emission properties. Herein, metal adlayers, including Ag, Al, and Zn, are employed to optimize the field emission properties of CsPbBr3 microarrays. The field emission properties of Ag modified CsPbBr3 microarrays outperforms Al or Zn modified CsPbBr3 microarrays. Notably, with an Ag thickness of 5 nm, we achieve the lowest turn-on field of 2.80 Vμm-1 and highest field enhancement factor of 7114.7. The enhanced performance is attributed to increased local electric fields between Ag clusters and extra emitting sites. The increased surface roughness resulting from the Ag modification is another critical factor that enhances the aspect ratio of the emitting materials. This study demonstrates the successful field emission properties optimization of CsPbBr3 microarrays using metal adlayers, offering insights into their application in field emission devices.